Raymond Daudel

Born February 2, 1920 in Paris, France. President of the European Academy of Arts Sciences and Humanities, Paris, France.

Doctor Honoris Causa of the Universities of Louvain, Uppsala and Barcelona; Honorary President of the International Academy of Quantum Molecular Science; Officer de la Légion D'Honneur; Officier de l'Ordre National du Mérite; Officier des Palmes Académiques. President of the European Academy of Arts, Sciences and Humanities.

Important Contributions:

Introduction of the concept of free valence number (with A. Pullman); Establishment of a decreasing relation between the free valence of a carbon atom of a conjugated hydrocarbon and the potential barrier of a substitution reaction occurring on this atom; Introduction of the concept of differential density showing the effect of bonding in molecules; Introduction of the concept of loge—region of an atom or a molecule in which there is a high probability of finding a given number of electrons with a certain distribution of their spins; Discovery of the dependance of the mean life of a radioelement of the electronic density near the radioactive nucleus.